Insulator.



F. J. SOHISLER.

INSULATOR. APPLICATION FILED MAR.2'4, 1913.

Patented Nov. 10, 1914.

w-ummm 316%) MWW Frank J.Schis1er Quorum FRANK J. SOHISLER, FWINTI-IROP, MINNESOTA.

' INSULATOR.

Specification of Letters Patent.

Patented Nov. 10, 19141..

Application filed March 24, 1913. Serial No. 756,480.

To all whom/ it may concern Be it known that I, FRANK J. SoHIsLER, a

citizen of the United States, residing at Winthrop, in the county ofSibley and State of Minnesota, have invented certain new and usefulImprovements in Insulators; and I do declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to whichit appertains to make and use thesame.

This invention relates to electric conductors, and more especially toinsulators; and the object of the same 1s to produce an insulator ofglass or the like reinforced with metal so as to form a slottherethrough in which the line wire lies but wherein it is not fastened,the result being that it may slide through the insulator if the poleslean in either direction or unusual tension should be thrown on the wireat any point.

Other objects and advantages will appear from the followingspecification and claims,

- and the device is shown in the accompanying drawings wherein p Figure1 is an elevation of this insulator taken from one end of the slotthrough it, the lower-portion of the insulator being in verticalsection. Figs. 2 and 3 are eleva tions of difierentfor'ms' ofthe-metallic lining. Fig. 4 is a cross section through a metallic liningof slightly different construction in that it has an upstanding tongueiii addition to the others, and Fig. 5 is a Slmi lar cross section ofyet another form of lining which'is V-shaped at the bottom. Fig. 6 1s aperspective view of the wire screen reinforce.

The body Gof this insulator will bypreference be made of glass, having adeep transverse slot S across itsupper end and a threaded hole H in itslower end to screw the body.

onto the "upstandingpeg in the cross arm of the 'pole as usua butwheresay glass throughout the specification and claims, it is quite obviousthat other insulating material could be employed. Long experience hasshown that a chea grade 0 green glass is best adapted to'th s use, andit may be well to assumethatsuch is the material of Ordinarily suchinsulators are molded in rough outlineyand commonly they are providedwith an annular groove across one side of which the line wire extends,while a .tie wire passes around the other sideof' this groove and hasits ex;

tremities connected with said line wire. In a certain class ofinsulators the fastening means take the form of a notch or a deep slotformed in the top of the glass body, and the wire is passed therethroughand secured therein in any suitable manner. It is common with linemen,however, to attach the line wire to each insulator insome way so that itcannot slip therethrough and will not be disconnected therefrom by windand storm. The object of the present invention is to avoid the necessityfor making such attachment and to permit the wire to lie free within aslot in the insulator so that it can move therethrough, although someprovi- S1011 is made for preventing its disengagement with the slot.Another contingency is that mischievous boys or hunters ofter throw orshoot at these glass insulators and break them, and frequently put theline out of business because the line wire and its fastening. devicefall away from the insulator and become entangled with the pole and itsarms and pegs, so that the line is short circuited and in some instancesbroken. This I seek to overcome by molding a reinforce of wire screeninginto the body G as the latter is formed, and even if the same is crackedor broken by malicious persons the glass inside this wire screenreinforce will be sufiicient to sustain the line wire if the miscreantshould continue his depredations until the insulator is entirelydestroyed.

Coming now to the details of the present invention, the slot S acrossthe top of the glass body G is preferably ovoid in shape, although itmay come to an angle at the bottom as seen in Fig. 5, but in any eventits outlet or mouth is preferably narrower than the remaining portion ofthe slot so that the sheet metal lining l is held therein. Said liningis inserted in the mold at the time the glass body is'made, and saidbody allowed to shape itself around the lining in a manher which will beclear. However, I do not wish to be limited to the manner in which thisdevice is formed, as it is quite possible to mold the glass body andspring the metallic lining l thereinto later. The body 1 of the metalliclining is substantially V- shaped, angular at the bottom as seen in Fig.5 or rounded as elsewhere illustrated, its sides diverging from eachother upward from this point, then converging near the top of the slotS, and then bent sharply outward into two lips 2 which are intended tolie within rabbets 3 formed in the top of the body G at opposite sidesof the slot S. In side view the lining as thus constructed appears asshown in Figs. 2, 3 and 5, in all of which instances its ends areflanged as at 4% and bent outward to enlarge the ends of the openingthrough which the line wire asses and to remove sharp corners thererom.In the construction shown in Fig. 2 the sides of said body are cut withU-shaped slits 5 forming tongues 6 and 7 in opposite sides and out ofregister with each other, and these tongues are subsequently bent inwarduntil their lower extremities overlap slightly as seen in Fig. 1. In theconstruction shown in Fig. 3 a single and wider tongue 8 is cut in.either side of the body, and the lower ends or tips of the two tonguesare bent into contact with each other. In the construction shown in Fig.4 the tongues 6 and 7 are again employed, although they are somewhatsmaller than illustrated in Fig. 2, but here an additional tongue 9 iscut from one side and projects upward from.

the bottom line 10 of the lining as shown. The metal bf which thislining is made will by preference be either galvanized iron so that itcannot rust, or suitably treated to the same end, and its size and exactconfiguration is immaterial excepting that it will conformproportionately with the size of the class insulator employed. Inconnection with this sheet metal lining I preferably employ a metalreinforce for giving strength to the glass body Gr, and this I make inthe shape of a truncated cone 15 and from wire screen. as'seen in Fig. 6andas indicated in section in Fig. 1. The same is placed within the moldin which the glass body G is to be formed, and molded therein at thetime the same is made, the fact that it has open ings through itpermitting-the molten glass to run through them and incorporate itselfthoroughly with thIs reticulated .reinforce. Opposite the point wherethe slot S exists, the upper or smaller end of this tubular reinforce isslotted as at 16 so that in the finished article there is an openingcompletely across the upper end of the reinforce for the passage of theline wire. The hole H in the lower end of the reinforce for permittingit to be screwed onto the peg as usual will of course stand within thelarger end of the reinforcing element 15, and there should be sufiicientglass around this hole inside of the wire screen-and around the body Goutside the wire screen to resist the normal strains that are thrownonto an insulator and the the bottom 10 of this lining plate.

S, when it passes between the two lips 2 of V the ,sheet metal lining,then drops between the tongues 6 and 7 or between the meeting tips ofthe tongues 8, and comes to rest at If the additional tongue 9 beemployed asshown in Fig. 4, the line wire after slipping off theside-tongue 7 will pass into contact with this tongue 9, and sli theangle 10 at the ottom of the lining where itis held with a certaindegree of down the same into friction, due to the fact that the tongue 9is deflected inward as illustrated in, Fig. 4. The depth of the notches16 in the screen reinforce is of course suflicient to keep it entirelyout of contact with the wire where laterally or longitudinally of theinsulator do not wear the wire or produce any noise;-

in fact, I have found by experience that the noticed in telegraph andtelephone poles, and this I consider an important feature of myinvention. Having dropped the wire intothe reinforced slot as described,it can drawing on it so that it will slip through the metal lming 1 asthe necessities of the case. Therefore the lineman needs may require. notools in putting a wire onto an insulator of this character, and if hebe suficiently expert he may lift the wire from the ound 7 use of ametallic lining of this character and with which the wire makes constantcontact prevents that humming or singing commonly and drop it into theopen mouth of t e metalllc llmng without even ascending the pole.

After the line is completed and the linemen have departed, breaking ordamaging of the wire is prevented by the fact that it may slip throughthe lining as the necessities of the case may requlre. For instance,assume that a pole begins to tip. or lean in one direction along theline-hitherto this would tighten the stretch of wire at .one side andloosen that on the other, but with the usel of this improved metalllclining the insu-v lator simply slips along the wire at the point wherethe pole gets'out of place.- If

it should-so happen that the wire has to be taken ofi theinsulator, thelineman will insert a screw driver or similar tool longitudi nally intothe device and pry the tongues 105 be tightened from either side bysimply a apart if that type of the device be preferred.

It may happen that the telephone ortelefiaph company prefers that thewire shall tied, and the construction of my improvement is such thatsuch requirement can be complied with by drawing the ordinary tie wirearound the insulator and securing it at either side of the same to theline wire. fact, it is preferred to tie the line wire to all insulatorswhere the line makes an angle or where it introduces a switch.

While it may be preferred in some cases to cheapen the device byomitting the wire screen reinforce, I consider it extremely practical asprotecting the glass against loss in case it should become cracked.Assuming that such provision has been made'and a boy throws at it untilhe is successful in breaking the glass, the result will be that the in,the upper portion of said slot terminatmg in a contracted mouth and thetop thereof being also offset to provide seats at the edgesforming themouth of said slot, a metallic lining applied to the walls of said slotto completely cover the same, outwardly bent flanges at the upper edgesof said lining forming lips forcreception snugly in the aforesaid seatsof said body, means on said lining for loosely retaining the wire inplace in said slot, and outwardly bent flanges formed on the end edgesof said lin-" ing continuing along the bottom and the greater portionofthe height of the sides thereof, said last mentioned flanges overlyingthe corners of the body at the sides and bottom of the slot therein toprevent longitudinal movement of the lining in said slot and also toprotect the corners of the, body from the wire which is loosely disposedthrough said slot.

ZfThe herein described insulator comprising a body of non-conductingmaterial having a transverse slot in the top thereof and designed toloosely receive a line wire therein, the upper portion of said slotterminating in a contracted mouth, a metallic linin applied to-the wallsof said slot to completely cover the same, inwardly extending tonguesstruck from the opposite walls of said lining to.form a retaining meansfor a wire in said slot, and an additional tongue struck from the bottomof said lining and directed upwardly and outwardly toward one side wallthereof.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses.

Witnesses: A.'L. YOUNG,

CHAs. W. QUANDT.

FRANK JfsoHIsLER,

